Diagnostic Trouble Code
P189C — Transmission Clutch B — Performance / Stuck Off
Transmission Clutch B — Performance / Stuck Off
Definition
The TCM has detected that clutch B in the transmission is not engaging properly or is stuck in the released position. This is typically seen in modern multi-clutch automatic and DCT transmissions where precise clutch engagement is electronically controlled.
Common Causes
- Worn clutch B friction material
- Failed clutch actuator or solenoid
- Internal hydraulic leak in clutch B circuit
- TCM calibration issue requiring software update